Platform Express
It’s about time
Applications
■
Reservoir delineation
■
Hydrocarbon saturation
determination and imaging
■
Movable hydrocarbon
determination
■
Location of porous and
permeable zones
■
Gas detection
■
Porosity analysis
■
Lithology determination
■
Well-to-well correlation
■
Thin-bed analysis
Benefits
■
Less rathole needed for the
shorter length, lowering
drilling time and cost
■
More reliable performance
for reduced downtime, which
saves rig time
■
Real-time, depth-matched
logs for improved interpretation and accurate
reserves interpretation
■
Better-quality logs, more data
and higher resolution, revealing hard-to-find pay zones
■
Fifty percent reduction in
time spent on location,
significantly lowering
operating costs
■
Short-radius wells readily
logged
Revolutionary wireline
logging technology
Platform Express* technology is a
revolutionary reengineering of wireline
logging. Compared with the triplecombo, Platform Express logging is
about twice as fast, gives you better
answers and it is more cost effective
to run because it requires significantly
less rig time. Higher logging speeds,
reduced set-up and calibration time,
and faster turnaround on wellsite
processing all contribute to increased
efficiency.
The Platform Express system is less
than half as long as a triple-combo and
weighs about half as much, yet it gives
you better, quicker and more accurate
answers—in real time. The use of integrated sensors, flex joints that improve
pad contact and other innovative
technologies upgrade and expand
traditional resistivity and porosity
measurements to include high-resolution microresistivity and imaging
measurements, plus tool movement
measurements for speed correction
and depth matching.
In field tests conducted over a wide
range of environmental conditions in
Argentina, Canada, Indonesia, Saudi
Arabia and the United States, rugged
Platform Express equipment achieved
the most trouble-free wireline performance ever. The major reason for
this outstanding reliability is that all
Platform Express components must
pass the same rigorous shock and
cyclical temperature tests used for
logging-while-drilling (LWD) tools.
The resulting reliability is 3 times
greater than that of conventional
triple-combo tools.
The Platform Express system is less than half as long as a triple-combo, and the logging speed is twice as fast.
Set-up time is greatly reduced, and operating efficiency is improved.
Triple-combo
Features
■
Overall length greatly reduced
through the use of integrated
sensors and reengineering
■
Extremely robust electronic
packaging and mechanical
design
■
All components built to rigorous LWD shock standards
■
Real-time speed correction
■
Thirty percent shorter skid
with improved pad application
■
Integrated Rxo measurement
■
Density, Rxo and Rt measurements, and deep and shallow
azimuthal images
■
Real-time depth matching and
borehole correction
90 ft
Platform Express
38 ft
Houston, Texas
32E-001234
US DOT 253896
Platform Express measurements
Platform Express sensors set new
standards in formation evaluation
accuracy. Resistivity measurements
are made with either the AIT* Array
Induction Imager Tool or the HighResolution Azimuthal Laterolog Sonde
(HALS), both with a 12-in. maximum
vertical resolution.
Sensors for the Three-Detector
Lithology Density (TLD) and MicroCylindrically Focused Log (MCFL)
measurements are integrated in the
single pad of the High-Resolution
Mechanical Sonde (HRMS), which
presses against the formation. The
TLD log is a backscatter-type density
measurement with 16-, 8- or 2-in. vertical resolution. The MCFL microresistivity measurement, which investigates
the same volume of the formation as
the density measurement, has 2-in.
vertical resolution. Flex joints greatly
improve pad application in rough holes.
The Highly Integrated Gamma Ray
Neutron Sonde (HGNS) provides gamma
ray and neutron porosity measurements with a standard vertical resolution of 24 in. Alpha processing is
available to achieve 12-in. vertical
resolution of the neutron log.
Real-time speed correction and
automatic depth matching of all measurements are provided by an accelerometer for much faster turnaround on
wellsite processing.
Two Platform Express logging configurations are available for resistivity measurement. The vertical
resolution for each measurement is shown in the blocks on the right. These, in combination with the
new sensor design, provide better, more accurate measurements, leading to improved interpretation
and reserves calculations.
HGNS
Highly Integrated
Gamma Ray
Neutron Sonde
GR
24 in.
φN
24 in.
Electronics
cartridge
ρb, Pe
16, 8
or 2 in.
HRMS
High-Resolution
Mechanical
Sonde
HALS
High-Resolution
Azimuthal
Laterolog
Sonde
Rxo, hmc
2 in.
AIT
Array Induction
Imager Tool
Rt
12 in.
Articulated tool design for enhanced
pad-to-borehole wall contact and
tool descent
The HRMS skid is innovatively linked with flex joints for improved pad application.
Flex joints enable the Platform Express
sonde to hinge or rotate slightly as the
tool body travels into and out of rough
hole sections. A second pair of arms
applies force directly to the back of
the skid, below its center, to keep the
skid face pressed against the wall when
the caliper arm hits a ledge. Together
with the shorter pad, the additional
backup arm and flex joints deliver
significantly improved measurements
in rough and deviated holes.
The short length and articulated
design of the sonde enable it to successfully traverse wells with a short
radius of curvature and wells containing severe doglegs.
Flex
joint
Flex
joint
Flex
joint
Flex
joint
The short length and articulated design make descent in short-radius and crooked wells easy.
Borehole
diameter
Maximum
buildup
angle
Specifications
8 in.
44°/100 ft
n
tio
via
de
ell
W
Casing shoe
Dogleg severity: 72°/100 ft
Field experience without
HALS and AIT tools
6 in.
76°/100 ft
Efficiency comparison
Two 7000-ft wells, each with a 2500-ft
openhole section, show the large reduction in rig time made possible by the
higher logging speeds and streamlined
operations of the Platform Express
system. In the Saudi Arabia well on
the left, Platform Express equipment
was run in combination with the DSI*
Dipole Shear Sonic Imager tool to save
more than 3 hr of rig time compared
with two runs of the triple-combo,
MicroSFL* and DSI tools. Two hours
of drilling were saved in the Argentina
well at right because less rathole had
to be drilled to accommodate the
shorter length of the Platform Express
tool string.
Reliability
Extensive field testing was conducted
around the world in a wide variety of
geologic settings and well conditions.
Reliability was more than 3 times
higher than that of conventional triplecombo tools.
Unequaled reliability results from
the system’s unique design and new,
tough temperature and shock qualification standards. Platform Express
standards include a 40-day heat test
and more than two thousand 250-g
shocks, making it the first wireline
tool in the industry that meets LWD
tool standards.
Platform Express system saves a substantial amount of rig time over the triple-combo.
Saudi Arabia
7000-ft well
2500-ft openhole
Argentina
7000-ft well
2500-ft openhole
Run 1: AIT-LDT-CNL-MSFL-GR
Run 2: DSI
AIT-LDT-CNL-MSFL-GR
Platform Express
and DSI
combination
Platform Express
7 hr 40 min 4 hr 20 min
Drilling rathole
Rig up, rig down
7 hr
Time
Calibrations
3 hr 20 min
Logging
Run in, pull out
Platform Express reliability is threefold that of the triple-combo.
Triple-combo
Platform Express
Platform Express quicklook
The Platform Express quicklook interpretation, available in real time during
logging, displays resistivity, porosity
and correlation curves with a lithology
column and water saturation image.
True resistivity, invaded zone resistivity
and crossplot porosity are computed
for display with the other curves.
A zone-of-interest flag appears on the
left side of track 6 wherever the effective porosity is greater than 3% and
water saturation is less than 40%.
Real-time depth matching and speed
correction of the data make this
presentation much more accurate than
Platform Express quicklook incorporates environmental correction in real time.
quicklook interpretations produced
at the wellsite from triple-combo data.
The Platform Express quicklook presentation is also available as a postjob
playback. This log was recorded with
the AIT resistivity configuration in the
Amoco test well in Catoosa, Oklahoma.
Platform Express answers
A very powerful answer results when
Platform Express equipment is oriented in the hole with an inclinometer
tool that provides tool face orientation
and the hole deviation and azimuth.
The high-resolution azimuthal laterolog
data are used to compute the dips
presented in track 5 and the polar plots
in track 6. Because the tool orientation
is known, the pad direction curve
appearing in the image in track 3 shows
the tool turning as it is pulled uphole.
This log was recorded in Texas.
Oriented HALS images provide valuable measurements in wells where no dipmeter data have been recorded.
Permeable zones
This Texas example shows the 2-ft vertical resolution curves with five depths
of investigation across several permeable zones. The Platform Express mud
resistivity measurement is used for
real-time environmental corrections.
The MCFL log is plotted to confirm
the AIT readings, and the resistivity
standoff—another exclusive measurement of the Platform Express
system—is computed from the MCFL.
Platform Express system accurately and quickly measures resistivity and shows permeable zones.
HMIN and HMNO are the two microlog curves computed from the MCFL
data. The red shading indicates thick
mudcake over these highly permeable
zones.
HALS resistivity
The ability to plot both shallow and
deep high-resolution azimuthal images
is another unique Platform Express
feature. In this log, recorded in a test
well in France in combination with an
inclinometer tool, the pad orientation
curves appear in the image tracks.
Dip estimates can be made where the
tool face orientation and hole deviation
and azimuth are known.
HALS images bring greater precision to bedding analysis.
X705
X710
X715
X720
X725
X730
X735
X740
Shallow
Image
Deep
Image
1:150
(m)
High-Resolution Laterolog Deep (HRLD)
0.02
(ohm-m)
High-Resolution Laterolog Shallow (HRLS)
2000
0.02
(ohm-m)
2000
MCFL with FMI image
Overlay of the MCFL curve with the
borehole image derived from the FMI*
Fullbore Formation MicroImager confirms the high vertical resolution of
Platform Express data. Conductivity
variation in the zone between X652
and X655 m in this Argentina well
is visible on both the MCFL data and
the FMI image.
MCFL measurements correlate well with FMI images for the identification and characterization of thin beds.
Core photograph comparison
The high-resolution data obtained by
the Platform Express tool can be used
to identify impermeable laminations
in the formation that can act as flow
barriers to production. In this well,
there was concern about the continuity
of limestone streaks in the formation,
which would help contain water below
the reservoir section and enhance the
steamflood of the reservoir. The core
data are not definitive: only limestone
cobbles were recovered, and they could
represent either the nature of the
deposition (nonbarrier cobble layer)
or the nature of the coring operation
(the coring process created rounded
fragments of a thin layer). However,
the consistent response of the TLD
and MCFL to these thin layers revealed
the continuity of the laminations, and
the operator was able to complete the
zone closer to the known water contact
of the reservoir with no additional
water cut.
The high-resolution (2-in.) density
and photoelectric factor measurements
clearly resolve the carbonate layers
and, with the addition of the 2-in.
resolution Rxo from the MCFL, also
identify thin oil-bearing layers.
Detailed comparison to core photographs confirms the resolution of the Platform Express system.
Caliper (HCAL)
Gamma Ray (HGR)
0
(gAPI)
6
150
1-ft Resistivity
Neutron Porosity
(HNPO)
1
(p.u.)
0
Depth
(1:20 ft)
XX32
XX33
XX34
XX35
XX36
XX37
XX38
XX39
XX40
XX41
XX42
XX43
(2-in.)
1
7
TDL 2-in. Density
(RHOI)
1.65
(g/cm3)
2.65
Standard Core
Photograph
2
(ohm-m)
100
1-ft Resistivity
Photoelectric Factor
(PEFI )
Ultraviolet-Light
Core Photograph
60
16
(ohm-m)
100
18-in. Resistivity
1
(ohm-m)
100
2-in. Resistivity
1
(ohm-m)
100
Customized answers
The integrated z-axis accelerometer in
the Platform Express system enables
speed correction of all data and determination of the wellbore deviation,
which is used to compute true vertical
depth (TVD) logs and plot the wellbore position of highly deviated and
horizontal wells. This customized plot
combines the measured-depth data
with a horizontal depth coordinate
system originating at the bottom of
the well. The color-coded bar next to
the depth track indicates the direction
of the well relative to horizontal (90°
deviation)—green to black where
descending and red to orange where
climbing in angle. Displaying the computed lithology color plot on the well
trajectory is ideal for showing not
only the position of a horizontal well
but also its attitude in reference to
intersected lithologic features.
In this example, the well penetrated
salt and anhydrite layers out of casing
and entered the sand reservoir. After
75 m in the sand, the well entered an
anhydrite layer and then went back
into a sand. Were there two anhydrite
layers or one displaced by a fault?
Or did the well turn up and reenter
the anhydrite layer above the reservoir?
The real-time display of Platform Express data is easily customized.
Porosity
Resistivity
Depth
1:1000
(m)
Well Trajectory
The well trajectory plot clearly
shows the well turning up before it
enters the anhydrite layer. A line drawn
along the sand/anhydrite contact indicates that the boundary has a uniform
structural dip along the section, which
effectively eliminates the possibility
of a second anhydrite bed and the
fault theory. The well simply reentered
the caprock anhydrite and then went
back into the sand reservoir. Without
the Platform Express well deviation
data, this analysis would have been
delayed until other well deviation data
could be correlated to the log data to
explain the lithology changes.
Speed correction
The importance of real-time speed
correction from the accelerometer
data is shown in this Texas example.
Despite the rough hole conditions and
irregular tool movements, the curves
after speed correction (on the right)
are consistent. The MCFL, AIT and
porosity curves track, resulting in
more accurate water saturation calculations—especially in thin permeable
beds. Improved depth matching at
about X095 shows clearly on the
enlarged depth scale. The off-depth
data to the left are without speed
correction.
Density in bad hole
This Texas well was drilled with
barite—a heavy mud that presents
problems for Litho-Density* tools.
Comparison of the Platform Express
density values with Litho-Density data
in the washouts clearly demonstrates
how Platform Express technology
greatly improves log quality in rough
holes. The TLD results are in excellent
agreement with the DSI data (shown
in green on the right), which are relatively unaffected by washouts. The
better quality density measurements
also facilitate petrophysical and seismic analyses.
Oriented HALS images provide valuable measurements in wells where no dipmeter data have been recorded.
0.1
Density
Rxo
Rxo
Density
1:50 ft
(ohm-m) 100 1.70 (g/cm3) 2.70
0.1 (ohm-m) 100 1.70 (g/cm3) 2.70
Caliper
AIT-H Curves
Neutron
AIT-H Curves
Neutron
10
20
(ohm-m)
60
(p.u.)
0
(ohm-m)
(in.)
60
(p.u.)
0
X090
X100
Substantially improved density measurement in bad hole conditions is possible with the Platform Express TLD tool.
Platform Express revolutionary reengineering of wireline logging is only
38 ft long and weighs 600 lbm.
Specifications
Length
Weight
Max OD
Min OD
Temperature rating
Pressure rating
Hole size
Max logging speed
HGNS
Highly Integrated
Gamma Ray
Neutron Sonde
Electronics
cartridge
HRMS
High-Resolution
Mechanical
Sonde
HALS
High-Resolution
Azimuthal
Laterolog
Sonde
38 ft
AIT
Array Induction
Imager Tool
38 ft
690 lbm
33⁄ 8 in
45⁄ 8 in
260°F
10,000 psi
6 to 16 in.
3600 ft/hr
www.connect.slb.com
SMP-5177
©Schlumberger
September 2001
*Mark of Schlumberger